Results 311 to 320 of about 2,467,830 (354)

C–H activation

2014
The C–H activation reaction is a reaction that cleaves a carbon–hydrogen bond. Here the carbon–hydrogen bond is mostly referred to unactivated carbon–hydrogen bonds.
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Cobalt-Catalyzed C–H Activation

ACS Catalysis, 2016
Catalytic C-H activation has emerged as a powerful tool for sustainable syntheses. In the recent years, notable success was achieved with the development of cobalt catalyzed C-H functionalizations with either in situ generated or single-component cobalt ...
Lutz Ackermann
exaly   +2 more sources

Electrophilic C−H Activation at {Cp*Ir}:  Ancillary-Ligand Control of the Mechanism of C−H Activation

Journal of the American Chemical Society, 2006
Density functional calculations on the low-temperature cyclometalation of dimethylbenzylamine with [IrCl2Cp*]2/NaOAc have characterized a novel electrophilic activation pathway for C-H bond activation. C-H activation occurs from [Ir(DMBA-H)(kappa2-OAc)Cp*]+, and OAc plays a central role in determining the barrier for reaction.
Davies, David L., Donald, S.M.A., Al-Duaij, O., Macgregor, S.A., Polleth, M.   +4 more
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Catalytic stereoselective benzylic C–H functionalizations by oxidative C–H activation and organocatalysis

Chemical Communications, 2009
An organocatalytic stereoselective alpha-alkylation reaction of aldehydes based on C-H activation is presented.
F. Benfatti, | M. G. Capdevila, | L. Zoli, | E. Benedetto, COZZI, PIER GIORGIO   +4 more
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C–H bond activation of ethylene by a zirconacycle

Chemical Communications, 2013
The reaction of C2H4 and β-SiH containing azasilazirconacycle Cp2Zr{κ(2)-N(SiHMe2)SiHMeCH2} (3), formed via a γ-abstraction reaction of Cp2Zr{N(SiHMe2)2}H (1), follows an unusual pathway in which a rare σ-bond metathesis reaction of ethylene generates a vinyl intermediate. That species undergoes a β-hydrogen abstraction under the reaction conditions to
KaKing, Yan, Aaron D, Sadow
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Concise Synthesis of Polysubstituted Carbohelicenes by a C−H Activation/Radical Reaction/C−H Activation Sequence

Angewandte Chemie, 2018
AbstractDisclosed herein is the merging of C−H activation and radical chemistry, enabling rapid access to a structurally diverse family of fused carbohelicenes through the fusion of α‐acetylnaphthalenes with alkynes under oxidative conditions. This cascade process exhibits exquisite chemoselectivity and regioselectivity.
Jiangliang Yin, Jingsong You
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Intramolecular C−H Activation Reactions of Molybdenacyclobutanes

Journal of the American Chemical Society, 2006
Molybdenacyclobutane complexes can be prepared by reaction of Cp*Mo(NO)(=CHCMe3) (formed spontaneously by loss of neopentane from Cp*Mo(NO)(CH2CMe3)2 (1) under ambient conditions) with cyclic olefins, including cyclopentene, cycloheptene, and cyclooctene. The cyclopentene metallacyclobutane orients the metallacycle bridgehead protons cis to each other.
Peter M, Graham, Miriam S A, Buschhaus, Peter, Legzdins   +2 more
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Carbonylative C–H Activations

2013
Transition metal-catalyzed carbonylation reactions represent an enormous toolbox for CO–X bond formation (X = C, N, O, etc.). While most coupling reactions take place with heteronucleophiles nowadays, carbonylations including C–H activation are attracting more and more attention because the use of stoichiometric amounts of organometallic reagents can ...
Matthias Beller, Xiao-Feng Wu
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A Minimalist Approach to CH Activation by Copper

Helvetica Chimica Acta, 2006
AbstractThe complex [Cu2(1)2]2+ (1 = 1,3‐bis(1‐methyl‐1H‐benzimidazol‐2‐yl)benzene) undergoes slow oxidation by dioxygen in DMF solution to give the hydroxylated product [Cu2(2‐H)2]2+ (2 = 2,6‐bis(1‐methyl‐1H‐benzimidazol‐2‐yl)phenol) characterized by an X‐ray crystal‐structure analysis. The oxidation occurs much faster when CuII is mixed with 1 in the
Kuebel Pollak, Anita, Ruttimann, Stéphane Joséph, Dunn, Nichola, Melich, Xavier, Williams, Alan Francis, Bernardinelli, Gérald Hugues   +5 more
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Diastereoselective Remote CH Activation by Hydroboration

Chemistry – A European Journal, 2004
AbstractHydroboration of tetrasubstituted or trisubstituted alkenes with BH3 and subsequent thermolysis allows remote diastereoselective CH activation of neighboring aryl rings. Tetrasubstituted and trisubstituted 1,1‐diphenylethylene derivatives undergo a highly stereoselective 1,2‐rearrangement followed by remote CH activation to lead, after ...
Jesús A, Varela, Diego, Peña, Bernd, Goldfuss, Dmitri, Denisenko, Jiri, Kulhanek, Kurt, Polborn, Paul, Knochel   +6 more
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